Need help in solving logarithmic equation

A ball is made of rubber, when dropped on a concrete floor, bounces up to 80% of the height from which it was dropped. The ball is dropped from 2m. After how many bounces will the ball not rise over 0.5 m?

A ball is made of rubber, when dropped on a concrete floor,
bounces up to 80% of the height from which it was dropped.
The ball is dropped from 2m.
After how many bounces will the ball not rise over 0.5 m?

A ball is made of rubber, when dropped on a concrete floor, bounces up to 80% of the height from which it was dropped. The ball is dropped from 2m. After how many bounces will the ball not rise over 0.5 m?